08/03/2026
Should I get the PSS Type A or the Pro Shaft Seal? We get this question a lot. The truth is, you can't go wrong with either one.
Both the PSS Type A Shaft Seal and PSS Pro Shaft Seal use the same proven mechanical face seal design that's been keeping boat bilges dry for decades. The main difference comes down to the bellows material and maintenance interval.
The Type A Shaft Seal uses a nitrile rubber bellows and has a recommended service interval of 6 years. It's the seal that boat owners, boatbuilders, and marine professionals have trusted for years.
The PSS Pro Shaft Seal takes things a step further with reinforced silicone bellows, an extended 8-10 year maintenance interval, and a built-in Shaft Retention Collar (SRC) for added security.
For many boat owners, the Type A is the perfect fit. For those looking for longer service intervals and some additional peace of mind, the Pro Shaft Seal is worth the upgrade.
At the end of the day, both seals are built around the same goal: reliable, dripless performance so you can spend less time worrying about your shaft seal and more time enjoying your boat.